Engine Question

Ouch! To do it properly, you should find a exact replacement and have it balanced like the other 7 are. If you can't find a replacement something close will make the cylinder work but it might not be the correct way to do it. Had a friend with a 440-6 in a 70 Bee. It had one .030 over piston in it. It ran good but wasn't the right way to fix it in my opinion.